"You cannot say it (anti-social behaviour) can be absolutely eliminated that would be false.
"But what you've actually got to actively do, professionally, is reduce that (level of anti-social behaviour) and this is the path to reducing the likelihood of that awful thing happening again."
More top news
Warming up over the next few days. Mostly dry in the south, rain at times in the north.
A petition for a statue of rapper Missy Elliott to replace a Confederate monument in Virginia has been signed by more than 15,000 people.
Grace Mugabe, the wife of Zimbabwean president Robert Mugabe, has returned home from Johannesburg.